PyGTK如何将不同的回调绑定到标签上的每个可点击文本？

import gtk

def callback1(widget, url):
    print("Clicked link 1:", url)

def callback2(widget, url):
    print("Clicked link 2:", url)

window = gtk.Window()
window.connect("destroy", gtk.main_quit)

label = gtk.Label()
label.set_markup('<a href="http://www.example.com">Link 1</a> and <a href="http://www.example.com">Link 2</a>')
label.connect("activate-link", callback1, "http://www.example.com")
label.connect("activate-link", callback2, "http://www.example.com")

window.add(label)
window.show_all()

gtk.main()